I found link to this tool on another forum:
Social Bookmarking Service & Web Tool Speeds Up the Bookmarking Process | Post Toaster
I have not tried it yet but if it works could be very useful.
It supposed to allow you to submit news to multiple social bookmarking sites simultaneously.
You can write up to 4 titles and descriptions and tool will randomly mix them up.
You have to be member of the network where you are trying to submit and logged in to your account.